Polymer mixtures for crosslinked fluids (fluid media)

FIELD: mining.

SUBSTANCE: fluid for treatment of wells contains a water-based liquid, a crosslinking agent and a gel-forming agent, containing a crosslinked polymer and a non-crosslinked biopolymer, where a molecule of the latter consists only of glucose or has the main chain, comprising a glucose link and a linear or cyclic monosaccharide link of the specified type, and ratio of a biopolymer to a crosslinked polymer makes 0.05-1:1. The method for treatment of a part of an underground bed includes provision of the above-specified liquid and its injection into a well shaft that penetrates into an underground bed. The above-specified method, where the liquid for treatment comprises a crosslinked polymer and diutan with diutan ratio to crosslinked polymer equal to 0.05-1:1.

EFFECT: improved rheological properties and temperature stability of gel-forming agents.

21 cl, 3 ex, 3 tbl, 4 dwg

 

Background of invention

The present invention relates to methods and compositions for treatment of underground formations. More specifically, the present invention relates to liquids (fluid environments) to handle containing the gel-forming substances, which include stitched polymers and some biopolymers, and to methods for use in underground work.

Fluid processing can be used in various types of underground processing, including processing for stimulation/well and treatment to combat the flow of sand (into the well), but is not limited to this. Used in this document, the term "treatment" or "implementation/execution processing"refers to any underground work, which is used as a fluid in communication with the desired function and/or for the desired goal. The term "processing", or "implementation/execution processing", does not imply any particular impact through the liquid or by means of any specific component of the fluid.

One of the common operations on the intensification of production, which apply the liquid to be processed, is a hydraulic fracture. Works on hydraulic fracturing, typically include pumping (pumping) in the trunk of the wells the ins fluid for processing (for example, fluid for hydraulic fracturing), which penetrates the subterranean formation at a hydraulic pressure sufficient to create or extend/lengthen one or more cracks, or gaps, in the underground reservoir. "Expand/extend one or more fractures in the subterranean formation, as that term is used in this document, is defined as including the extension or enlargement of one or more natural or previously created fractures in the subterranean formation. The fracturing fluid may include particulates, often referred to as "disjoining the particulates, which are deposited in cracks. Disjoining the particulates act, among other things, preventing full closure of the cracks at the drain of hydraulic pressure, forming the inlet channels through which (reservoir) fluid can flow into the wellbore. Once at least one fracture is created and disjoining the particulates are essentially in the right place (in the crack), the structure of the frac fluid can be "destroyed" (i.e. the viscosity of the liquid is lower), and the fracturing fluid may be extracted from the reservoir.

Fluid processing is also used in the treatment to combat the flow of sand (into the well), such as completing downhole filter gravel. In the treatments with filling the downhole filter is and gravel, in the liquid processing suspended particulate (usually called "gravel particulates"), which shall be deposited in the desired zone of the wellbore, for example, near unconsolidated or weakly compacted zones of the layer, with the formation of a gravel filter to improve combat the flow of sand into the well. One common type of filling of the downhole filter gravel has a mesh filter to combat the flow of sand into the well in the well bore and filling the annular space between the strainer and the wellbore gravel particles of a specific size designed to prevent the passage of formation sand. Gravel particulates act, among other things, preventing the clogging of a strainer formation particulate formation or moving particulate formation to produce hydrocarbons, and the strainer operates, among other things, preventing the flow of particulate in operational tubing column. When gravel filter for the most part is in the pit, the viscosity of the liquid for processing can be reduced in order to allow its removal. In some situations, these types of formation treatment as hydraulic fracturing and completing downhole filter gravel, unite is in single-stage processing (usually called operation "hydraulic fracturing using a propping agent (proppant)"). In such works on "hydraulic fracturing using proppant", the processing, as a rule, complete the installation of the unit mesh filter gravel packing in the bottom where the liquid is to handle reservoir hydraulic fracturing pumped through the annular space between the casing pipe and strainer. In this situation, the hydraulic fracturing treatment is completed under the condition of loss of proppant, when creating a circular gravel filter between the mesh filter casing and pipe. In other cases, the processing of hydraulic fracturing can be performed prior to installation of a strainer and placing gravel filter.

Maintaining sufficient viscosity of such liquids for processing is important for several reasons. Maintaining sufficient viscosity is important in the treatment of hydraulic fracturing and in combating the flow of sand into the well for transporting particulate and/or to create or increase the width of the cracks. Also, maintaining sufficient viscosity may be important for controlling and/or reducing fluid loss into the formation. At the same time, along with what is often desirable to maintain sufficient viscosity fluid for processing, also can be desirable to maintain the viscosity of the fluid for processing so that Vascos the ü could also be easily reduced for a specific time, including and subsequent extraction of the fluid from the reservoir.

To provide the desired viscosity in the fluid processing usually add polymeric gelling agents. The term "gelling agent" in this document to determine whether inclusion of any substance that is capable of increasing the viscosity of a liquid, for example, by gel formation. Examples of commonly used polymeric gelling agents include guar resin and its derivatives, cellulose derivatives, biopolymers, and the like, but is not limited to this. However, using a single gelling agent will need to limit the effect of the fluid properties, which can give a liquid used for processing the only gelling agent, with the exception of other properties that could give fluid for processing other gelling agents.

To further increase the viscosity of the fluid for processing a gelling agent often is crosslinked by using a crosslinking agent. Conventional crosslinking agents typically contain a metal ion that interacts with at least two molecules of the gelling agent with the formation of cross-linkages (linkage) between them, thus forming a cross-linked gelling agent. Liquid for the processing, containing crosslinked gelling agents may also be elastic or viscoelastic properties, where the cross-links between molecules of the gelling agent can be destroyed and re-formed, making it possible to vary the viscosity of the liquid under certain conditions, such as temperature, pH, and the like. However, the use of such cross-linking agents can be problematic. For example, in some cases, the molecules of the gelling agent can be crosslinked excessively in the presence of high concentrations of cross-linking agent, resulting in a fluid to be processed, which is sverhzapominaniya, hard to destroy the structure, exhibits syneresis (separation of the liquid in the gel), or has other undesirable rheological properties.

In this area known fluid to be processed, containing a mixture of xanthan, guar resins. When compared to liquids to treatment, which contain only one polymer gelling agent, the liquid to be processed, containing a mixture of xanthan, guar resin, can improve the ability of the fluid to be processed to move the proppant. However, mixtures containing xanthan and guar gum, as it was discovered, are unstable at higher temperatures (e.g., higher than about 150°F) in some underground the different layers and the well holes, where can be useful liquid for processing containing these compounds.

Summary of the invention

The present invention relates to methods and compositions for treatment of underground formations. More specifically, the present invention relates to liquids (fluid Wednesdays) for processing containing gelling agents, which include stitched polymers and some biopolymers, and to methods for use in underground work.

In one embodiment, the present invention provides a method for processing parts of the underground formation, comprising: providing a liquid to be processed, which contains the water-based liquid, a crosslinking agent, and a gelling agent comprising a polymer which is stitched polymer, and the polymer, which is a biopolymer, where the biopolymer molecule (1) consists only of glucose, or (2) has a main chain containing one or more parts that include at least (a) one glucose level and (b) one linear or cyclic monosaccharide link pyranose-type (a) and (b) have different molecular structures; and the introduction of the liquid to be processed in a wellbore penetrating a subterranean reservoir.

In yet another embodiment, the present invention provides a method of attack by the Oia, on the part of the underground formation, comprising: providing a liquid to be processed, which contains the water-based liquid, a crosslinking agent, and a gelling agent comprising a polymer which is stitched polymer, and the polymer, which is a biopolymer, where the biopolymer molecule (1) consists only of glucose, or (2) has a main chain containing one or more parts that include at least (a) one glucose level and (b) one linear or cyclic monosaccharide link pyranose type, where (a) and (b) have different molecular structure; and contacting the subterranean formation with a fluid treatment at a pressure sufficient to create or extend/extend one or more fractures in the portion of the subterranean formation, or at higher pressures.

In yet another embodiment, the present invention provides a method for processing parts of the underground formation, comprising: providing a liquid to be processed, which contains the water-based liquid, a crosslinking agent, and a gelling agent comprising a polymer which is stitched polymer, and deutan; and the introduction of the liquid to be processed in a wellbore penetrating a subterranean reservoir.

In one embodiment, the present invention provides a liquid processing, comprising: the liquid water is again; a crosslinking agent; and a gelling agent comprising a polymer which is stitched polymer, and the polymer, which is a biopolymer, where the biopolymer molecule (1) consists only of glucose, or (2) has a main chain containing one or more parts that include at least (a) one glucose level and (b) one linear or cyclic monosaccharide link pyranose type, where (a) and (b) have different molecular structures.

In yet another embodiment, the present invention provides a liquid processing, comprising: a water-based liquid; a crosslinking agent; and a gelling agent comprising a polymer which is stitched polymer, and deutan.

In yet another embodiment, the present invention provides a gelling agent, comprising: a polymer, which is a stitched polymer; crosslinking agent; and a polymer, which is a biopolymer, where the biopolymer molecule (1) consists only of glucose, or (2) has a main chain containing one or more parts that include at least (a) one glucose level and (b) one linear or cyclic monosaccharide link pyranose type, where (a) and (b) have different molecular structures.

Distinguishing features and advantages of this is th invention will be understood clearly experts in this field when reading the description of preferred embodiments, which follows.

Brief description of drawings

These drawings illustrate certain features of some embodiments of the present invention, and should not be used to limit or define the invention.

Figures 1A, 1b, 1C illustrate data related to the viscoelastic properties of various liquids for processing, including some embodiments of the liquids for processing according to the present invention.

Figure 2 illustrates data concerning other viscoelastic properties of various liquids for processing, including some embodiments of the liquids for processing according to the present invention.

Description of the preferred embodiments of the invention

The present invention relates to methods and compositions for treatment of underground formations. More specifically, the present invention relates to liquids to treatment, containing gelling agents, which include stitched polymers and some biopolymers, and to methods for use in underground work.

Fluid treatment of the present invention, generally contain a water-based liquid, a gelling agent, including some biopolymers and stitched polymer, and a crosslinking agent. Used in this document the term "stitched polymer clay is defined as meaning any polymeric substance, comprising at least two molecules that are capable of forming cross-linkage (the stitching) in the presence of a suitable crosslinking agent. Incidentally, the fluid treatment of the present invention can be improved viscoelastic properties, such as low shear viscosity, and reduced levels of syneresis in comparison with other liquids for processing known in this field. Such viscoelastic properties can make it possible, for example, slower settling of proppant, superior moving proppant, and a long relaxation times in some of the liquids to the processing of the present invention.

The water-based liquid used in the liquid processing of the present invention, may include fresh water, salt water (e.g., water containing one or more salts dissolved therein), brine (e.g., saturated mineral solution), seawater, or combinations thereof. Generally, the water may be from any source provided that it does not contain components that might adversely affect the stability and/or activity of liquids for processing of the present invention. In some embodiments, the exercise may be increased the density of liquid water based, among other purposes, to provide additional re is edenia particles and suspensions in liquids for processing of the present invention. In some embodiments, the implementation of the pH of the liquid water-based can be adjusted (for example, via a buffer solution or other agent, regulating pH), among other purposes, to facilitate hydration of the biopolymer to activate cross-linking agent, and/or to reduce the viscosity of the liquid for processing (for example, to activate the breaker, deaktivirovat crosslinking agent). In these embodiments, the implementation of the pH may be raised to a specific level, which may depend, among other factors, the types of biopolymers, cross-linking agents, and/or breakers included in the liquid for processing. Specialist with an average level of competence in this area, given the benefits of this disclosure, will recognize when such adjustment of the density and/or pH are appropriate.

Gelling agent included in the liquid processing of the present invention, contains certain biopolymers. The biopolymers used in the present invention have a structure where the biopolymer molecule (1) consists only of glucose, or (2) has a main chain containing one or more parts that include at least (a) one glucose level and (b) one linear or cyclic monosaccharide link pyranose type, where (a) and (b) have different molecular structures. Mention the "main chain", used in this document, refers to the longest sequence of elements in the molecule of the biopolymer. The pyranose monosaccharides type, typically characterized as having 5 carbon atoms and an oxygen atom in the ring of 6 atoms. Unlike biopolymers that can be included in the fluid to be processed, is already known in this field, biopolymers used in the present invention do not include xanthan gum. Examples of suitable biopolymers include Ditan, scleroglucan, succinogenes, and combinations thereof, and derivatives thereof, but is not limited to this. Used in this document, the term "derivative", as defined, includes any compound that is made from basic compounds, for example, by replacing one atom in the base compound with another atom or group of atoms, by ionization of one of the listed compounds, or by obtaining a salt of one of the listed compounds. The biopolymers used in the present invention, can be made by one or more cross-linking agents, or may not be crosslinked. In some embodiments, implementation of the present invention, the biopolymer can be presented in a concentrated aqueous solution prior to its Association with other components necessary for the formation of fluid for treatment of the present invention. In n which are variants of implementation of the present invention, the biopolymer may be presented in solution, which contains the other components of the fluid processing and/or gelling agent (e.g., stitched polymer).

Usually, the biopolymer may be present in the fluid treatment of the present invention in a quantity sufficient to provide the desired viscosity. In some embodiments, the implementation, the biopolymer may be present in an amount in the range of from about 0.01% to about 3% by weight of the fluid mass for processing (bwof"). In some examples of embodiments, the biopolymer may be present in an amount in the range of from about 0.1% to about 1% by weight relative to the weight of fluid for processing (bwof"). In some embodiments, implementation, biopolymers may be present in the fluid treatment of the present invention when the ratio of biopolymer to link the polymer in the range from about 0.05:1 to about 1:1. In some embodiments, the implementation of the biopolymers may be present in the fluid treatment of the present invention when the ratio of biopolymer to link the polymer is about 0.1:1. It is in the specified interval ratio is achieved technical effect of the invention in the form of improved rheological properties and thermal stability gelling agents for liquids for well treatment. Spiral is Noah ratio of biopolymer to link the polymer depends on a number of factors, such as the desired(s) the viscosity and/or elasticity, specific application, the conditions at the borehole bottom, water quality, and the like, which are understood by a person skilled in this field.

Gelling agent included in the liquid processing of the present invention may contain any suitable stitching polymer, including galactomannan gums, cellulose derivatives, combinations thereof, derivatives thereof, and the like, but is not limited to this. Galactomannan gums, typically characterized as having a linear mannanov the main chain, with different amounts of galactose units attached to it. Examples of suitable galactomannan gums include Arabian gum, gum, ghatti, gum karaya, tamarind gum, tragacanth gum, guar gum, gum carob, combinations thereof, derivatives thereof, and the like, but is not limited to this. Other suitable gums include gidroksimetilglutarovogo resin, hydroxypropranolol resin, carboxymethylamino resin, karboksimetoksimetilguanina resin and carboxyphenoxypropane resin, but is not limited to this. Examples of suitable cellulose derivatives include hydroxyethyl cellulose, carboximetilzellulozu, carboxymethylcellulose, and karboksimetiltselljuloza; their production is derivative, and combinations thereof. Stitched polymers included in the fluid treatment of the present invention can be natural, synthetic, or combinations thereof. Stitched polymers can include polymers capable of hydration, which contain one or more functional groups such as hydroxyl, cogitatione, carboxyl, sulphate, sulphonate, phosphate, phosphonate, amino, or amide groups. In some embodiments, implementation, stitched polymers can be at least partially crosslinked, where at least part of the molecules stitched polymers are crosslinked by a reaction comprising a crosslinking agent.

Stitched polymers should be present in the fluid treatment of the present invention in a quantity sufficient to provide the desired viscosity for processing. In some embodiments, implementation, stitched polymers may be present in amounts ranging from about 0.05% to about 3% by weight relative to the fluid processing (bwof"). In some embodiments, implementation, stitched polymers can be present in an amount in the range of from about 0.1% to about 1% by weight relative to the fluid processing (bwof"). In some embodiments, the implementation stitched polymers may be present is the ratio stitched polymer-to-biopolymer in the range from about 1:1 to about 20:1. In some embodiments, implementation, stitched polymers may be present in the ratio stitched polymer-to-biopolymer approximately 9:1. The ratio stitched polymer-to-biopolymer depends on a number of factors such as the desired(s) the viscosity and/or elasticity, specific application, the conditions at the borehole bottom, water quality, and the like, which the person skilled in the art will recognize. In some embodiments, implementation of the present invention, the stitching polymers and/or biopolymers can be presented in a concentrated aqueous solution before combining them with other components necessary for the formation of fluid for treatment of the present invention. In some embodiments, implementation of the present invention, the stitching polymers can be represented in the solution, which contains the other components of the fluid processing and/or gelling agent (e.g., biopolymer).

Crosslinking agents typically include a liquid for the processing of the present invention for stitching at least part of the molecules stitched polymer with the formation of cross-linked polymer. The term "crosslinking agent"as it is defined in this document, includes any molecule, atom, or ion, which(th) capable(EN) to form one or more cross-linking (cross-linking) between the molecules can be stapled p is limera and/or between one or more atoms in a single molecule stitched polymer. A crosslinking agent in the fluid treatment of the present invention may contain a metal ion that is capable of crosslinking at least two molecules stitched polymer. Examples of suitable crosslinking agents include borate ions, ions of zirconium IV ions of titanium IV ions, aluminum, antimony ions, chromium ions, iron ions, copper ions, and zinc ions, but is not limited to this. These ions can be obtained by ensuring that any compound that is able to give one or more of these ions; examples of such compounds include boric acid, octoborate-tetrahydrate disodium, Deborah sodium, pentaborate, ulexite, colemanite, zirconium lactate, zirconiated-triethanolamine, zirconium carbonate, zirconium acetylacetonate, zirconium malate, zirconium citrate, Diisopropylamine-zirconium lactate, titanium lactate, titanium malate, titanium citrate, titanium ammonium lactate, titanium triethanolamine, and titanium acetylacetonate, aluminum lactate, aluminum citrate, antimony compounds, chromium compounds, compounds iron, copper compounds, zinc compounds, and combinations thereof, but is not limited to this. An example of a suitable commercially available compound capable of providing metal ions, represents a cross-linking agent CL-24™", available at Halliburton Energy Services, Inc., Duncan, Oklahoma. In some embodiments, the implementation of this izopet the tion, a crosslinking agent may be present in the crosslinked polymer, where at least part of the molecules stitched polymer are crosslinked by a crosslinking agent.

In some embodiments, the implementation of the cross-linking agent may include a crosslinking agent in slow motion, which can be designed to form cross-links between molecules of the polymer after a certain time or under certain conditions (e.g. temperature, pH, and so forth). In some embodiments, the implementation of liquid for processing can include slow crosslinking agent, such as agents, inhibiting the binding of the polysaccharide, derived from the guar resin, the guar derivative resins, or cellulose derivatives. Inhibiting the crosslinking agent may be included in the fluid to be processed, among other things, and to slow stitching stitched polymers as long as it is desirable. Specialist with an average level of competence in this area, given the advantage, given this description, will know what an appropriate amount of retarding crosslinking agent should be included in the liquid processing for the desired application.

Suitable crosslinking agents may be present in the fluid treatment of the present invention in a quantity sufficient to ensure that h is the following, the desired degree of crosslinking molecules stitched polymers. In some embodiments, the implementation of the cross-linking agent may be present in the fluid treatment of the present invention in amounts in the range from about 10 ppm ("ppm") to about 500 ppm by weight relative to the liquid to be processed. In some examples of embodiments of a crosslinking agent may be present in the fluid treatment of the present invention in amounts in the range from about 75 ppm to about 200 ppm by weight relative to the liquid to be processed. Specialist with an average level of competence in this area, given the benefit of this disclosure, will understand the appropriate type and amount of crosslinking agent to be included in the fluid treatment of the present invention based on, among other things, the temperature conditions of a particular application, the type of stitched polymers, molecular weight stitched polymers, and/or pH of the fluid to be processed.

Fluid treatment of the present invention optionally may contain particulates such as particulate proppant (proppants or gravel particulates. The particulates suitable for use in the present invention, can soda in order to avoid any material suitable for use in underground work. Suitable materials for such particles include sand, bauxite, ceramic materials, glass materials, polymer materials, materials of Teflon®, pieces of walnut shell media, particulate utverzhdenii resin containing pieces of nut shells, pieces of husk sunflower seeds, particulate utverzhdenii resin containing pieces of husk sunflower seeds, pieces of fruit seed, particulate utverzhdenii resin containing pieces of fruit and seeds, wood, particulate from a composite material, and combinations thereof, but is not limited to this. Suitable particulate composite may contain a binder and a material-filler, where suitable materials-fillers include silicon dioxide, aluminum oxide, pyrolytic carbon, carbon black, graphite, mica, titanium dioxide, metasilicate, calcium silicate, kaolin, talc, Zirconia, boron, fly ash, hollow glass microspheres, nepustotelym glass, and combinations thereof. The size of the particles, as a rule, can vary in the range from about 2 mesh to about 400 mesh on the scale of the Sith: U.S. Sieve Series; however, in some circumstances, it may be desirable for other dimensions, which will be fully qualified for the practical application of the present invention. In particular the variants of implementation, the preferred ranges of the distribution of particles by size is one or more of the ranges: 6/12, 8/16, 12/20, 16/30, 20/40, 30/50, 40/60, 40/70, or 50/70 mesh. It should be understood that the term "macro particle"used in this disclosure, includes all known shapes of materials, including substantially spherical materials, fibrous materials, polygonal materials (such as cubic materials), and mixtures thereof. Moreover, fibrous materials that can be used or not be used to withstand the pressure of a closed crack can be included in some embodiments of the present invention. In some embodiments, the implementation of the particulates included in the fluid treatment of the present invention, can be covered with any suitable resin or an agent that increases the stickiness, which is known to specialists with an average level of competence in this area. In some embodiments, the implementation of the particulates may be present in the fluid treatment of the present invention in amounts in the range from about 0.5 pounds per gallon ("ppg") to about 30 pounds per gallon by volume relative to the fluid to be processed.

Gel or gel and crosslinked fluid processing can also include internal reagents for destruction gel C is slow steps, such as an enzyme, an oxidizer, an acid buffer solution, or temperature-activated. gel. Reagents for the destruction of the gel causes the transfer of viscous liquids for processing in thin fluids that can be delivered back to the surface after they have been used for placing particulate proppant in subterranean formations. In some embodiments, the implementation of the reagent used for the destruction of the gel may be present in the fluid to be processed number in the range from about 0,0001% to about 10% by weight relative to the gelling agent.

Fluid treatment of the present invention optionally may include one or more additives from a number of well-known additives, such as gel stabilizers, additives, regulating water flows, acids, corrosion inhibitors, catalysts, anti clays, biocide, bactericide agents, friction reducers, gas, surfactants, soljubilizatory, pH adjustment agents, and the like. For example, in some embodiments, the implementation, it may be desirable to foam the fluid treatment of the present invention using a gas, such as air, nitrogen, or carbon dioxide. Specialists with an average level of competence in this area, given the benefit of this description, the cm is able to determine the appropriate supplements for your specific application.

Fluid treatment of the present invention can be prepared by any method suitable for this application. For example, some components of the fluid treatment of the present invention (e.g., stitched polymers, biopolymers, and so on) can be provided in the form of pre-mixed powder that can be combined with the water-based liquid in a later time. When cooking liquids for processing of the present invention can be adjusted pH of the liquid water-based to facilitate hydration of the gelling agent, along with other purposes. The pH range in which the gelling agent will be easy to hydrogenate itself, may depend on a number of factors (for example, the components of the gelling agent, and so on), which the person skilled in the art will recognize. This pH adjustment may occur before adding, while adding or after addition of the gelling agent and/or other components of the fluid treatment of the present invention. For example, fluid treatment of the present invention may contain ester, which when injected into the well releases acid which is capable, in particular, to lower pH and/or viscosity of the liquid to be processed. After the unification of the pre-mixed powders of the liquid water-based, before introduction into the borehole may be added a crosslinking agent and other suitable additives. Specialists with an average level of competence in this area, given the benefit of this disclosure, will be able to determine other suitable means to obtain fluids for processing according to the present invention.

The methods of the present invention can be applied in carrying out any underground processing where it can be used viscoelastic fluid for processing. Suitable underground processing may include processing with hydraulic fracturing, treatment to combat the flow of sand into the well (for example, filling the downhole filter gravel), and other suitable processing may be a suitable liquid for the processing of the present invention, but are not limited to these. In one embodiment, the present invention provides a method for processing parts of the underground formation, comprising: providing a liquid (fluid medium) for processing, which contains the water-based liquid, a crosslinking agent, and a gelling agent containing the first polymer, which is a stitched polymer and a second polymer, which is a biopolymer, where the biopolymer molecule (1) consists only of glucose, or (2) has a main chain containing one or bol is e links, which include at least (a) one glucose level and (b) one linear or cyclic monosaccharide link pyranose type, where (a) and (b) have different molecular structures; and the introduction of the liquid to be processed in a wellbore penetrating a subterranean formation. Following the introduction of the fluid to be processed in a wellbore, the fluid viscosity for processing can be lowered to the desired point in time, and the liquid to be processed with reduced viscosity can be removed and/or transported back (on the surface) in the wellbore.

To facilitate understanding of the present invention, the following examples of some features of some embodiments. The following examples should not be construed as limiting or defining the scope of the invention.

EXAMPLES

Used in the following examples, the unit "ppt" refers to the pounds of dry ingredient per 1000 gallons of fluid.

Example 1

Samples of three liquids for processing with the following compositions are prepared in vessels of 400 ml: a liquid Sample 1 contains 45 ppt (pounds of dry ingredient per 1000 gallons of fluid) the guar resin in solution with 2% KCl by weight in tap water obtained from Duncan, Oklahoma; the Sample liquid 2 contains a 40.5 ppt the guar resin and 4.5 ppt xanthan gum solution with 2% KCl by weight in vocopro the ne water received from Duncan, Oklahoma; and a Liquid Sample 3 (sample of fluid for treatment of the present invention) contains a 40.5 ppt the guar resin and 4.5 ppt ditana in solution with 2% KCl by weight in tap water obtained from Duncan, Oklahoma. In each sample add sand Brady, having a range of particle distribution size 20/40, in the amount of 3 pounds per gallon of liquid ("ppg"), and then each sample is heated on a water bath to 77°F. When the temperature of the sample reaches this value, in each sample mixed into a pre-set amount (see table 1 below) borate crosslinking agent, using a Waring mixer for 30 seconds. Subsequently, the sample is again placed in a water bath. In table 1 below lead time of deposition (i.e. the time for which 3 ppg sand fully deposited in the vessel) for each of the three samples.

A test using a swing frequency when low-amplitude pulse shift ("SAOS") also conducted on each of the sample liquids using a clamping device for cylindrical cuvette on a Stresstech rheometer (available in the company Rheologica Instruments), before stitching, and after fusion of the sample liquids. In this test, the specimen is subjected to a sinusoidal shear strain ofγ=γ0sinωtwhereγ0represents the amplitude of deformation is the purpose of ωrepresents the frequency of oscillation. The reaction voltage when the shift is aσ=G'sinωt+GcosωtwhereGis a dynamic modulus of elasticity in the phase of the applied shear strain, and G" is the loss modulus out of phase overlap shear (or in phase with the applied rate of shear strain).

In figures 1A, 1b and 1C shows a graph of the dependence of the frequency on dynamic modulus and loss modulus, obtained in tests using swing frequency when low-amplitude pulse bias for the base and stitched liquids, respectively, for each of the three samples. In table 1 below the transition frequency (ωc) (i.e. the frequency where G'=G", i.e. the point where the elastic reaction liquid at high frequencies is separated from the viscous response at low frequencies, indicated on each figure) for crosslinked fluid in each of the three samples. Lower values of the frequency of the transition, as a rule, correspond to higher relaxation times for liquids, which indicates improved static suspension fluid properties.

Table 1
The number borato what about the cross-linking agent
(gallons per 1000 gallons of fluid ("gpt"))
Settling time (hours) (approx.)The transition frequency
with) (rad/sec)
The liquid sample 1180,16
The sample liquid 21(suspended)1---
The liquid sample 31120,11
1The sand in this sample, the liquid remained suspended and not settle.

Example 2

Samples of three liquids for treatment with the compositions described in example 1 above, are prepared in vessels of 400 ml In each sample add sand Brady, having a range of particle distribution size 20/40, in the amount of 3 pounds per gallon of liquid ("ppg"), and then each sample is heated on a water bath to 150°F. When the temperature of the sample reaches this value, in each sample mixed into a pre-set amount (see table 2 below) borate crosslinking agent, using a Waring mixer for 30 seconds. Subsequently, the sample is again placed the Ute in a water bath. A test using a swing frequency when low-amplitude pulse shift ("SAOS"), described in example 1 above is also performed on each of the samples. In table 2 below lead time of deposition (i.e. the time for which 3 ppg sand fully deposited in the vessel) and the transition frequency (ωwithfor each of the three samples.

Table 2
The amount of borate cross-linking agent
("gpt")
Settling time (hours) (approx.)The transition frequency
with) (rad/sec)
The liquid sample 13,7510,46
The sample liquid 24,2510,90
The liquid sample 34,7520,20

Example 3

Samples of three liquids for treatment with the compositions described in example 1 above, are prepared in vessels of 400 ml each of the sample liquid add sand Brady, having a range of particle distribution size 20/40, if the este 3 pounds per gallon of liquid ("ppg"), and then each sample is heated on a water bath to 150°F. When the temperature of the sample reaches this value, in each sample admixed borate crosslinking agent in an amount of 5 gpt, using a Waring mixer for 30 seconds. Subsequently, the sample is again placed in a water bath. The amount of solvent displaced from each liquid sample is recorded every 10 minutes during the time period of one hour. These observations are summarized in table 3 below and in the Figure 2 graph based time (min) from the total number of displaced solvent (vol.%).

Table 3
Time (min)The total number of displaced solvent (vol.%)
The liquid sample 1The sample liquid 2The liquid sample 3
101000
2028100
3048244
4052284
5056326
6060328

Thus, examples 1-3 illustrate that the fluid treatment of the present invention can exhibit improved rheological properties.

Therefore, the present invention is well adapted to achieve these aims and advantages and objectives and advantages, which are an integral part of the present invention. Specific embodiments of which are disclosed above are illustrative only, since the present invention can be modified and implemented in practice, different but equivalent ways that are obvious to experts in the field, armed with the advantage of the ideas of this invention. Despite the fact that the person skilled in the art may make numerous changes, such changes are within the essence of this invention, which is defined by the attached claims. In addition, there are no restrictions related to the details of the interpretation or sample, showing the authorized in this document, other than described in the claims below. Therefore, it is evident that the particular illustrative embodiments of which are disclosed above may be altered or modified and all such variations are considered as falling within the scope and essence of the present invention. In particular, every range of values (for example, "from about a to about b," or, equivalently, "from approximately a to b, or, equivalently, "from approximative a-b"), disclosed in this document should be understood as referring to the illustrative set (set of all subsets) of the respective range of values. The terms in the claims have easy, normal value, if the patentee is not defined clearly different meaning.

1. The fluid processing wells containing:
the water-based liquid;
a crosslinking agent, and
gelling agent containing the polymer, which is a stitched polymer, and
the polymer, which is a biopolymer, where the biopolymer molecule
(1) consists only of glucose or
(2) has a main chain containing one or more links that include at least (a) one glucose level and (b) one linear or cyclic monosaccharide link pyranose type, where (a) and (b) have different mole is warnie patterns, and
where the ratio of the biopolymer and the stitching of the polymer is from about 0.05:1 to about 1:1.

2. The fluid processing according to claim 1, where the ratio of the biopolymer and the stitching of the polymer is from about 0.05:1 to about 0.1:1.

3. The fluid processing according to claim 1, where the biopolymer is selected from the group consisting of ditana, scleroglucan, Coccinellidae, derivatives thereof, and combinations thereof.

4. The fluid processing according to claim 1, where the stitching polymer selected from the group consisting of Arabian gum, gums, ghatti, gum karaya, tamarind gum, tragacanth gum, the guar resin, gum carob, cellulose, derivatives thereof, and combinations thereof.

5. The fluid processing according to claim 1, where the crosslinking agent is chosen from the group consisting of borate ions, zirconium IV ions of titanium IV ions, aluminum, antimony ions, chromium ions, iron ions, copper ions, zinc ions, and combinations thereof.

6. The fluid processing according to claim 1, additionally containing at least one element selected from the group consisting of reagents for the destruction of the gel, gel stabilizers, additives, regulating water flows, acids, corrosion inhibitors, catalysts, anti clays, biocide, bactericide agents, friction reducers, gases, surfactants, agents that slow sshi is the W, solubilization, particulates, pH adjustment agents, derivatives thereof and combinations thereof.

7. The method of processing parts of the underground formation, comprising:
providing fluid to be processed, which contains
the water-based liquid,
a crosslinking agent, and
gelling agent containing the polymer, which is a stitched polymer, and
the polymer, which is a biopolymer, where the biopolymer molecule
(1) consists only of glucose or
(2) has a main chain containing one or more parts that include at least (a) one glucose level and (b) one linear or cyclic monosaccharide link pyranose type, where (a) and (b) have different molecular structures, and the ratio of the biopolymer and the stitching of the polymer is from about 0.05:1 to about 1:1; and
the introduction of the liquid to be processed in a wellbore penetrating a subterranean reservoir.

8. The method according to claim 7, where the ratio of the biopolymer and the stitching of the polymer is from about 0.05:1 to about 0.1:1.

9. The method according to claim 7, where the biopolymer is selected from the group consisting of ditana, scleroglucan, Coccinellidae, their derivatives, and combinations thereof.

10. The method according to claim 7, where the stitching polymer selected from the group consisting of Arabian gum, gums, ghatti, gum karaya, tamarind to the copper, tragacanth gum, the guar resin, gum carob, cellulose, derivatives thereof, and combinations thereof.

11. The method according to claim 7, where at least part of the molecules stitched polymer is subjected to crosslinking by reaction comprising a crosslinking agent.

12. The method according to claim 7, where a crosslinking agent selected from the group consisting of borate ions, zirconium IV ions of titanium IV ions, aluminum, antimony ions, chromium ions, iron ions, copper ions, zinc ions, and combinations thereof.

13. The method according to claim 7, where the liquid for processing further comprises at least one element selected from the group consisting of breakers gel, gel stabilizers, additives, regulating water flows, acids, corrosion inhibitors, catalysts, anti clays, biocide, bactericide agents, friction reducers, gases, surfactants, agents, inhibiting the binding of solubilization, pH adjustment agents, derivatives thereof and combinations thereof.

14. The method according to claim 7, where
liquid for processing further comprises particulate and
the method further includes placing at least a portion of the particles in the portion of the subterranean formation or in a nearby area part of an underground reservoir.

15. The method according to claim 7, further comprising adjusting the pH of the liquid water-based.

16. The method according to claim 7, the stage is niteline comprising reducing the viscosity of the liquid for treatment following the introduction of the fluid to be processed in a wellbore.

17. The method of processing parts of the underground formation, comprising:
providing fluid to be processed, which contains
the water-based liquid,
a crosslinking agent, and
gelling agent containing the polymer, which is a stitched polymer, and
deutan where deutan is not sewn with the above crosslinking agent, and the ratio ditana and stitched polymer is from about 0.05:1 to about 1:1; and
the introduction of the liquid to be processed in a wellbore penetrating a subterranean reservoir.

18. The method according to 17, where the ratio ditana and stitched polymer is from about 0.05:1 to about 0.1:1.

19. The method according to 17, where the stitching polymer selected from the group consisting of Arabian gum, gums, ghatti, gum karaya, tamarind gum, tragacanth gum, the guar resin, gum carob, cellulose, derivatives thereof, and combinations thereof.

20. The method according to 17, where at least part of the molecules stitched polymer is subjected to crosslinking by reaction comprising a crosslinking agent.

21. The method according to 17, further comprising adjusting the pH of the liquid water-based.



 

Same patents:

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EFFECT: raised efficiency of procedure due to more complete mixing of suspension and solution, reduced power and material expenditures.

2 cl, 3 tbl, 2 ex, 1 dwg

FIELD: gas and oil production.

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16 cl

FIELD: oil and gas production.

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FIELD: gas and oil production.

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28 cl, 1 ex, 4 dwg

FIELD: oil and gas production.

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1 tbl, 4 dwg

FIELD: oil and gas production.

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17 cl, 4 ex, 5 dwg

FIELD: mining.

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6 cl, 3 dwg, 2 ex, 1 tbl

FIELD: oil and gas production.

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3 tbl, 1 ex

FIELD: oil and gas production.

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1 tbl, 1 ex

FIELD: oil and gas production.

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18 cl, 9 tbl, 35 ex, 2 dwg

FIELD: chemistry.

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9 cl, 2 ex, 2 tbl

FIELD: gas and oil production.

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3 cl, 2 ex, 1 tbl

FIELD: gas and oil production.

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1 ex, 1 tbl

FIELD: chemistry.

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2 cl, 2 tbl, 12 ex

FIELD: gas and oil production.

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8 cl, 2 ex, 1 tbl

FIELD: gas and oil production.

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21 cl, 9 ex, 16 tbl, 5 dwg

FIELD: gas and oil production.

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3 cl

FIELD: gas and oil production.

SUBSTANCE: water composition for reservoir hydraulic fracturing contains water, ion-bound gel-like system including charged polymer, oppositely charged foaming agent and gas. The gel-like system and gas are present in amount sufficient for production of ion-bound foamed composition for hydraulic fracturing. Composition contains liquid for hydraulic fracturing including 5.5-7 gpt of the above said gel-like system and de-ionised water. The procedure for production of foamed compositions consists in production of the first composition, the second composition and in adding it to the first one at their specified ratio. The procedure for reservoir hydraulic fracturing includes production of liquid for hydraulic fracturing containing the above said gel-like system and proppant and in its pumping into the reservoir. The procedure for reservoir hydraulic fracturing includes production of liquid for hydraulic fracturing containing the above said gel-like system, its pumping into the reservoir at pressure of hydraulic fracturing and in pumping proppant after hydraulic fracture.

EFFECT: facilitating reservoir hydraulic fracturing at deficiency of hydration units.

45 cl, 1 tbl

FIELD: gas and oil production.

SUBSTANCE: water composition for reservoir hydraulic fracturing contains water, ion-bound gel-like system including charged polymer, oppositely charged foaming agent and gas. The gel-like system and gas are present in amount sufficient for production of ion-bound foamed composition for hydraulic fracturing. Composition contains liquid for hydraulic fracturing including 5.5-7 gpt of the above said gel-like system and de-ionised water. The procedure for production of foamed compositions consists in production of the first composition, the second composition and in adding it to the first one at their specified ratio. The procedure for reservoir hydraulic fracturing includes production of liquid for hydraulic fracturing containing the above said gel-like system and proppant and in its pumping into the reservoir. The procedure for reservoir hydraulic fracturing includes production of liquid for hydraulic fracturing containing the above said gel-like system, its pumping into the reservoir at pressure of hydraulic fracturing and in pumping proppant after hydraulic fracture.

EFFECT: facilitating reservoir hydraulic fracturing at deficiency of hydration units.

45 cl, 1 tbl

FIELD: gas and oil production.

SUBSTANCE: composition of thermal source for treatment of bottomhole zone of well consists of granulated ammonia saltpetre of grade B, bi-chromate of potassium, epoxy resin of grade ED-20, plasticiser EDOS, and hardener Agidol of grade AF-2M. As components increasing strength of material of composition and temperature of its combustion compression this composition contains mixture of powders of aluminium of dispersity not over 50 mcm and nitro-acid barium of dispersity not over 0.5 mm at the following ratio of composition components, wt %: said saltpetre 52.5-53.0, potassium bio-chromate 2.4-2.5, epoxy resin of grade ED-20 14.3-14.4, plasticiser of grade EDOS 1.3-1.4, hardener Agidol of grade AF-2M 2.1-2.2, aluminium 10.9-10.5, and nitro-acid barium 16.5-16.0.

EFFECT: raised temperature of combustion of thermal source composition facilitating more deep heating and melting deposits of bottomhole zone of a reservoir, which plug channels and pores, while maintaining level of strength for compression of composition material.

FIELD: production and exploratory well drilling, particularly foaming drilling fluids used during penetration through incompetent rock intervals and during primary productive oil and gas deposit opening in the case of abnormally low formation pressure.

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EFFECT: reduced power inputs for well drilling, as well as reduced coefficient of friction between drilling tool and well wall.

1 tbl

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